Patent US2680063A successfully refreshed from Google Patents.
US4223412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Implants for bones, joints or tooth roots
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1977-12-15
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Granted: 1980-09-23
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Expires: 1997-12-15
Abstract
Abstract Implants for bones, joints or tooth roots having sufficient mechanical strength, excellent compatibility with living tissues and other advantageous properties can be obtained by thermally spraying a mixture of ceramics and hydroxyapatite onto a shaped core which is made of ceramics, thereby forming a coating layer of the mixture around the surface of the core.
Inventors
- 👤 Masaya Aoyagi
- 👤 Mikio Hayashi
- 👤 Yasuyuki Yoshida
- 👤 Yoshiaki Yao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
A; A61; A61L; A61L27/00; A61L27/28; A61L27/30; A61L27/32; A61C; A61C8/00; A61C8/0012; A61C8/0013; A61F; A61F2/00; A61F2/02; A61F2/28; A61F2/30; C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; A61F2310/00; A61F2310/00389; A61F2310/00592; A61F2310/00796
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
46 words
An implant comprising a shaped ceramic core having a uniform coating of a porous layer formed by plasma spraying onto the core a mixture consisting essentially of a ceramic material and hydroxyapatite, wherein said hydroxyapatite is present in an amount of 10 to 90% by weight.
Claim 2
Dependent Claim
46 words
An implant comprising a shaped ceramic core having a uniform coating of a porous layer formed by plasma spraying onto the core a mixture consisting essentially of a ceramic material and hydroxyapatite, wherein said hydroxyapatite is present in an amount of 10 to 90% by weight.
Claim 3
Dependent Claim
16 words
The implant according to claim 1, wherein the shaped ceramic core is made of aluminum oxide.
Claim 4
Dependent Claim
22 words
The implant as disclosed in claim 1 wherein said porous layer is applied to a thickness of not more than 1,000 microns.
Claim 5
Dependent Claim
17 words
The implant as disclosed in claim 3 wherein said porous layer is 100 to 300 microns thick.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |